Commands to the computer Essay

Function centrals crosswise the top Letter notices in the main section A numeric keypad on the right Cursor give outment and editing keys amid the main section and the numeric keypad. The layout of the letters on a keyboard is measuring across many countries and is called a QWERTY keyboard. The name comes from the first six keys on the top row of the alphabetic characters. Some keyboards come with added keys for utilise the profits and others have an integrated wrist support. Ergonomic keyboards have been developed to ignore the risk of repetitive strain injury to workers who enforce keyboards for long periods of time.The calculators processor s throw outs the keyboard hundreds of times per second to see if a key has been pressed. When a key is pressed, a digital code is sent to the fundamental Processing Unit (CPU). This digital code is translated into ASCII code (Ameri hobo Standard work out of datarmation Interchange). For example, pressing the A key produces the bina ry code 01100001 representing the dismantle type letter a. Holding down the shift key at the same time produces the binary code 01000001 representing the upper case letter A. Advantages Most computers have this device attached to it It is a reliable method for data input of text and numbers.A accomplished typist can enter data truly quickly. Specialist keyboards are uncommitted Disadvantages It is very easy to make mistakes when typing data in It can be very time consuming to enter data using a keyboard, especially if you are not a skilled typist. It is very difficult to enter some data, for example, details of diagrams and pictures. It is very slow to price of admission menus and not flexible when you want to move objects around the screen trying for people unable to use keyboards through paralysis or muscular disorder. Mouse A reverse is the most common pointing device that you impart come across.It enables you to control the stool and position of the on-screen cursor b y sorrowful it around on the desk. Buttons on the nobble let you select options from menus and gasp objects around the screen. Pressing a purloin button produces a nobble frank. You might have heard the expressions double click, click and drag and drag and drop. Most mice use a teentsy thumping located underneath them to calculate the direction that you are moving the mouse in. The movement of the ball causes two rollers to rotate inside the mouse one records the movement in a north-south direction and the other records the east-west movement.The mouse monitors how far the ball turns and in what direction and sends this information to the computer to move the pointer. Advantages Ideal for use with desktop computers. Usually supplied with a computer so no additional cost. All computer users tend to be well-known(prenominal) with using them. Disadvantages They need a flat property close to the computer. The mouse cannot easily be used with laptop, notebook or palmtop comput ers. (These need a tracker ball or a touch sensitive pad called a touch pad). Trackball A tracker ball, is care an upside down mouse with the ball on top.Turning the ball with your hand moves the pointer on the screen. It has buttons like a standard mouse, but requires very little space to pop off and is often used in conjunction with computer aided design. You ordain often find a small tracker ball built into laptop computers in place of the conventional mouse. Advantages Ideal for use where flat space close to the computer is limited. Can be useful with laptops as they can be built into the computer keyboard or clipped on. Disadvantages Not supplied as standard so an additional cost and users have to learn how to use them a joy stick is simalar to the mouse but turns at the sidesa joy stick is used to play computer games it turns in 8 dirtion and is used for controlling things like cars advantge there is an idmete feel of dirction due to the movement of the stick disavantges it s hard to controlthey can break ealisy This put down was downloaded from Coursework.Info The UKs Coursework Database http//www. coursework. info/ This document was downloaded from Coursework. Info The UKs Coursework Database http//www. coursework. info/ This document was downloaded from Coursework. Info The UKs Coursework Database http//www. coursework. info/ This document was downloaded from Coursework.Info The UKs Coursework Database http//www. coursework. info/ This document was downloaded from Coursework. Info The UKs Coursework Database http//www. coursework. info/ This document was downloaded from Coursework. Info The UKs Coursework Database http//www. coursework. info.